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The fresh meat must (keep) in the fridge.
The fresh meat must BE KEPT in the fridge.
You don't understand the question. You can't (listen) to the teacher.
You don't understand the question. You can't HAVE BEEN LISTENING to the teacher.
This room should (clean) a long time ago.
This room should HAVE BEEN CLEANED a long time ago.
He's too tired today. He must (stay) up all night.
He's too tired today. He must HAVE STAYED up all night.
Tom has a test tomorrow. He's watching TV now but he should (study) for the test.
Tom has a test tomorrow. He's watching TV now but he should BE STUDYING for the test.
The problem of white rhinos' extinction should (solve) a long time ago.
The problem of white rhinos' extinction should HAVE BEEN SOLVED a long time ago.
More things must (do) to solve global warming.
More things must BE DONE to solve global warming.
She looks exhausted. She must (jog) all morning.
She looks exhausted. She must HAVE BEEN JOGGING all morning.
He's become a bad student. I wonder what could (happen) to him.
He's become a bad student. I wonder what could HAVE HAPPENED to him.
We can't trust her. She must (watch) over carefully.
We can't trust her. She must BE WATCHED over carefully.
She is angry. He (keep) his promises.
She is angry. He SHOULD HAVE KEPT his promises.
Where is your brother? He (do) his homework now.
Where is your brother? He COULD BE DOING / MUST BE DOING his homework now.
You look awful. You (see) a doctor.
You look awful. You SHOULD SEE a doctor.
When I was 3, I (ride) a bike.
When I was 3, I COULD RIDE a bike.
